Because the switchgear is in the operation state of high voltage and high current for a long time, it is easy to have various faults, one of the most common faults is partial discharge. Partial discharge can cause damage to the insulation and reduce the service life of the equipmentIn addition, arcing and short circuits can occur, which can easily lead to equipment failure. The existence of partial discharge will not only affect the normal operation of the switchgear, but also pose a threat to the stability of the entire power system. Therefore, it is of great significance to monitor the partial discharge of the switchgear.
Partial discharge monitoring system is a new type of monitoring technology, which can monitor the partial discharge inside the switchgear in real time, find and warn of faults in time, and effectively avoid accidents. It has the advantages of strong real-time, high accuracy and timely warning. In practical applications, it can effectively find the potential faults of the switchgear, avoid accidents, and improve the stability and reliability of the power system.
The partial discharge monitoring device designed and developed by Shaanxi public can effectively detect the partial discharge phenomenon inside the switchgear and warn potential faults in time. It can effectively reduce the occurrence of equipment failures and help improve the stability and reliability of the power system.
The partial discharge monitoring system of the switch cabinet is mainly composed of three parts: sensor, signal processing unit and data analysis unit. The sensor is responsible for collecting partial discharge signals, the signal processing unit preprocesses and extracts features from the collected signals, and the data analysis unit performs pattern recognition and fault diagnosis on the extracted features. The acquisition of partial discharge signals is mainly realized by capacitive coupling and other methods. In signal processing, commonly used methods include filtering, amplification, detection, etc. Data analysis is to extract the characteristic quantities of partial discharge, such as discharge amount, discharge phase, discharge waveform, etc., through analysis methods such as time domain, frequency domain and modulation domain. Through the analysis of these characteristic quantities, the operating status of the switchgear and the type of potential fault can be determined.